10. Rock Climbing -- Yosemite, California

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Yosemite National Park contains some of the world's most challenging, iconic climbs. In fact, the park itself was integral to the foundation of the sport, offering everything from mere bouldering to massive granite monsters like El Capitan. The latter of which you may remember from a little movie called Star Trek V, in which an intrepid, albeit older, Captain Kirk fell off the face. If adventure and a serious physical challenge are what you're seeking, Yosemite and her natural granite architecture is your destination.